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A kind of biomass-based enzyme pretreatment bleaching method of pulp

A biomass and pretreatment technology, applied in pulp bleaching and other directions, can solve the problem that the effect of xylanase is not very ideal, and achieve the effects of good bleachability, improved whiteness and reduced cost.

Inactive Publication Date: 2016-06-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of the above two reasons, the effect of xylanase on some specific pulps is not very satisfactory

Method used

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  • A kind of biomass-based enzyme pretreatment bleaching method of pulp

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Embodiment 1

[0032] A biomass-based enzyme pretreatment bleaching method for pulp, comprising the following steps:

[0033] (1) Send unbleached waste paper pulp (43.3% whiteness) into the reaction kettle, add water to adjust to medium concentration (15wt%), stir evenly, add biomass-based enzyme solution to treat waste paper pulp (the amount of biomass-based enzyme is 200mL / t absolute dry pulp, the treatment temperature is 50°C, and the treatment time is 2h), then control the temperature until the pulp temperature reaches the required temperature of 70°C for bleaching, send the waste paper pulp treated with biomass-based enzymes into the bleaching tower, and add ClO at the same time 2 Mix evenly for reaction (ClO 2 The dosage is 10kg / t dry pulp) The reaction time is 2h, and the reaction temperature is 70-100°C to obtain a section of bleached pulp;

[0034] (2) Put the bleached pulp obtained in step (1) into a warm water extractor for a mild and weak base extraction, wherein the pH of the ...

Embodiment 2

[0045] Example 2: The specific steps are as described in Example 1, except that the amount of biomass-based enzyme used in the two-stage pretreatment process is 100mL / t, the treatment time is 1h, and the treatment temperature is 40°C. Whiteness is 72.2% ISO.

Embodiment 3

[0046] Example 3: The specific steps are as described in Example 1, except that the amount of biomass-based enzyme used in the two-stage pretreatment process is 300mL / t, the treatment time is 3h, and the treatment temperature is 60°C. The obtained bleached pulp 1-3 Whiteness is 79.7% ISO.

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Abstract

The invention discloses a biomass-based enzyme pretreatment bleaching method for pulp. The method comprises the following steps: feeding the pulp into a reaction kettle and adding a biomass-based enzyme solution for treatment; then sending the pulp treated with the biomass-based enzyme into a bleaching tower, adding oxidizing chemicals at the same time, and obtaining a bleached pulp. After obtaining a section of bleached pulp in the present invention, a section of bleached pulp can also be subjected to a section of gentle extraction; then the extracted slurry is sent to a secondary reaction kettle, and under the condition of a pH value of 5-10, biomass-based The enzyme solution is subjected to a secondary treatment; the pulp after the secondary treatment is passed into a second-stage bleaching tower for hydrogen peroxide bleaching to obtain a second-stage bleached pulp, and the above operation steps can be repeated as required. The invention can reduce the addition of bleaching agents and other chemicals, thereby reducing costs, not only improving the physical properties of the pulp, but also reducing the pollution load of bleaching wastewater.

Description

technical field [0001] The invention belongs to the field of pulp and paper bleaching, and in particular relates to a biomass-based enzyme pretreatment bleaching method for pulp. Background technique [0002] The paper industry is a traditional industry in my country, and paper is closely related to people's lives. With the development of society, my country's total paper consumption has surpassed that of the United States to rank first in the world, and the per capita paper consumption has also increased year by year. In order to save resources and reduce costs, waste paper pulp has become the most important type of pulp produced by my country's pulp and paper industry, mainly used in newsprint, writing paper, and packaging paper. [0003] In the production process of waste paper pulp, pulp bleaching is an important process, which can improve the whiteness of pulp, give paper a certain strength and provide a uniform printing surface. Traditionally, the pulp and paper indu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/10
Inventor 杨仁党阮蒙杨飞
Owner SOUTH CHINA UNIV OF TECH
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